Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f239117d7ad59a…

MALICIOUS

PDF

72.8 KB Created: 2020-11-24 08:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673282011e677c16d95284dac8e56af1 SHA-1: d04967141091019a71870da27a7c0e349260323f SHA-256: 70f239117d7ad59acf4937c1527caa11e73536536a90cfb72e9b3a168d7beca7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of the embedded URLs, 'https://traffmen.ru/123?utm_term=lanshan+2+weight', is flagged as a known malicious redirector. The presence of numerous links suggests an attempt to manipulate search engine results or direct users to malicious sites, aligning with phishing or SEO spam tactics. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffmen.ru/123?utm_term=lanshan+2+weight
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/nikozigizapib-wuwupoxatalam-wafewegu-sikepewame.pdf
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5fa058655077f.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_5fadadab93a14.pdf
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5fa4a325e6ffc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lepefi/smoke_and_mirrors_song.pdf
    • https://s3.amazonaws.com/levovod/52653010115.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/parewufixufovor.pdf
    • https://s3.amazonaws.com/kosipefojaw/upmc_parking_costs.pdf
    • https://s3.amazonaws.com/bunobu/noxojidekezetomemunutuzot.pdf
    • https://s3.amazonaws.com/zuwimadaneb/birthday_wishes_for_husband_in_malayalam.pdf
    • https://uploads.strikinglycdn.com/files/8fd6d6b3-f0a3-4dc4-aacc-76bb2f73d9c7/26579213443.pdf
    • https://uploads.strikinglycdn.com/files/243791e3-4fd5-4c55-9041-eac425852b77/neson.pdf
    • https://uploads.strikinglycdn.com/files/2509d85c-e1b1-4ab0-a704-cd99ebee1acb/1348765486.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d439.bin
23cc83116e3a18737276933c0b77c20fc0ad8baef22b619ccf17da85e51d76df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 4660 bytes
font_01_sfnt_off0000e417.bin
0b1a27fe8ba3140da43aab9aef0bea12eeba7cd5311d7ef819fbf40ab9ed3a41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10616 bytes
font_02_sfnt_off0001083c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 4324 bytes

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